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Old February 15th, 2008, 07:17
indy_xj indy_xj is offline
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Join Date: Mar 2007
Location: indy
Posts: 28
Re: 0331 head swap, mpg change?

Quote:
Originally Posted by keep0njeepin0n
...example...he used to get gas after using 15 gallons, but now gets gas after 13.5 gallons....not actual numbers, just an example of what I meant
I havent acctually got out the pencil and slide rule for this one. Its based on a lot of perception. But here's the deal:

I usually stop for gas when the needle is around 1/8th, but before the idiot light comes on. This usually leads to around 15-16 gallons of fillup. That hasnt changed since the swap. I reset the trip odo ever tank. I used to always get 230-240 miles/tank. If a tank had some highway miles i could get 260/tank. Now I am coming in at 200/tank. You might be right. If i drove that extra 2 gallons out of the tank i would be getting a similar 230/tank. But, my mpg numbers are so far off. The mpg calc i am using is from the overhead console. I know its not exact, but i think its margin of error is better than 20% (17.5 vs. 13.5).

thanks,

ixj
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